Explanation

Explanation

Molluscs are soft-bodied animals that may or may not have a shell and can live in aquatic environments like ponds, lakes, rivers, and oceans.

Examples include snails, clams, and octopuses

Explanation

Amylase is the enzyme that breaks down starches into sugars, and it is secreted by the salivary glands during the process of digestion.

Explanation

 Coal gas composition:

Typically contains around 50% hydrogen, 35% methane, and 10% carbon monoxide. 

Production method:

Coal is heated in the absence of air to produce these gases. 

Explanation

False ceilings help in improving insulation, cooling, and acoustics, while also providing a clean space to hide wires and pipes.

Explanation

Spirogyra is a filamentous green alga classified under the Kingdom Protista.

It lives mostly in freshwater.

It is known for its spiral chloroplasts.

Explanation

Asteroids are actually larger than meteoroids, not smaller.

They are made of rock or metal and revolve around the Sun like planets.

Explanation

Guava is a flowering plant because it produces flowers that later develop into fruits.

Ferns, Thuja, and Sago palms are examples of non-flowering plants.

Explanation

Nuclear energy is produced by splitting atoms (fission) and relies on uranium, a finite resource, making it non-renewable.

Renewable sources like solar, geothermal, and biomass naturally replenish over time.

Explanation

Upthrust (or buoyant force) happens only when a body is physically in contact with a liquid.

Electrostatic magnetic force between two magnets, and gravitational forces act at a distance without contact.